<%@page import="org.apache.commons.lang3.StringUtils"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	String callback = request.getParameter("callback");
	if(StringUtils.isEmpty(callback)){
		out.print("{\"name\":\"zhangsan\"}");
	} else {
		out.print(callback + "({\"name\":\"zhangsan\"});");
	}
%>